How to Replace the Fan Motor in a Ceiling Cassette Mini Split

Replacing the fan motor in a ceiling cassette mini split (like MRCOOL's Out-of-Sight Ceiling Cassette) involves a bit more effort than with a wall-mounted unit, due to the concealed nature of the system. Here's a brief, technician-level summary of the process:

🛠️ How to Replace the Fan Motor in a Ceiling Cassette

1. Power Down

• Turn off power at the breaker to ensure complete system safety.

• Use a voltmeter to verify no voltage is present before starting.

2. Remove the Cassette Grille

• Detach the decorative panel/grille by unclipping or unscrewing it.

• Set the panel aside carefully to avoid damage.

3. Disconnect the Drain and Panel Wiring

• Unplug any control wiring or LED indicators that go to the panel.

• If necessary, disconnect the drain hose to improve access.

4. Remove the Fan Housing

• Unscrew and remove the blower wheel cover or motor bracket.

• Take a photo first — this helps when reassembling.

5. Disconnect the Fan Motor

• Locate the fan motor assembly — it’s typically mounted behind or beside the blower wheel.

• Unplug the electrical connector to the motor.

• Loosen or remove the set screw holding the motor shaft to the blower wheel.

• Slide the motor out carefully.

6. Install the New Motor

• Align and insert the replacement motor.

• Reattach the motor shaft to the blower wheel using the set screw.

• Reconnect the wiring harness.

7. Reassemble

• Secure all screws, brackets, and wiring.

• Reconnect the drain hose, if applicable.

• Reattach the grille and decorative panel.

8. Test the System

• Restore power at the breaker.

• Use the remote or thermostat to activate the unit and verify fan operation.

⚠️ Pro Tips:

• Always refer to the specific unit’s service manual.

• Ceiling cassette components can be heavy — a second person is helpful.

• Clean the blower wheel and surrounding area while you’re in there.